00:02
Hi there.
00:02
In this question, we are trying to convert from a distance in kilometers to a time in hours.
00:16
Okay, and we are given the information that the rider can cover 18 miles in one hour.
00:27
That is her speed, 18 miles for every hour.
00:31
So this gives us a way to get from miles to hours.
00:38
We can convert from miles to hours by using this equality.
00:42
Well, we need a way to get from kilometer to miles.
00:45
So we need to look up that information.
00:48
And we see that the equality is that one kilometer is equal to 0 .6214 miles.
00:59
Okay, so now we have a plan to solve this problem, and we have the necessary conversion factors.
01:04
So let's set up our dimensional analysis and solve the problem.
01:09
The biker wants to travel 212 kilometers.
01:12
So notice this has three significant figures.
01:17
The first thing we're going to do is to convert from kilometers to miles by using this equality written as a conversion factor...